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Mechanism for hand off using subscriber detection of synchronized access point beacon transmissions

a subscriber detection and beacon technology, applied in the field of cellular and wireless local area networks, can solve the problems of battery power and therefore limited operating time, limited throughput of wan network, and inability to coordinate cellular and wlan power saving mechanisms for dual-mode or multi-mod

Inactive Publication Date: 2006-02-23
MOTOROLA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] The advantage of the present invention is that the mobile station may maintain its WLAN transceiver equipment powered off and need not transmit or receive WLAN messaging except during the predetermined time interval which is synchronized between an access point and the mobile station.

Problems solved by technology

For example, WAN network throughput is often limited and tariffed heavily.
A problem with mobile devices is that they are battery powered and therefore have a limited operating time proportional to the size of battery utilized.
While the WAN and WLAN systems provide mechanisms for reducing power individually, no mechanism exists to coordinate cellular and WLAN power savings mechanisms for dual-mode or multi-mode mobile stations that communicate with cellular networks as well as WLANs.

Method used

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  • Mechanism for hand off using subscriber detection of synchronized access point beacon transmissions
  • Mechanism for hand off using subscriber detection of synchronized access point beacon transmissions
  • Mechanism for hand off using subscriber detection of synchronized access point beacon transmissions

Examples

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first embodiment

[0020] In accordance with the present invention, a WLAN access point is synchronized with a wide area network (WAN) via either a backhaul connection, or via hardware of the WLAN access point suitable for receiving and decoding a synchronization timing signal from the WAN.

[0021] The WLAN access point may then transmit a beacon signal during a defined time window. The mobile station is aware of the time window and only powers its WLAN transceiver circuitry on during the appropriate window. Because the WLAN access point is synchronized to the WAN, the mobile station is able to anticipate the appropriate time window for power up. When the mobile station detects the WLAN access point beacon, it notifies the WAN, via a WAN base transceiver station (BTS) and proceeds to hand over idle mode signaling from the serving BTS to the WLAN access point.

second embodiment

[0022] In accordance with the present invention, the mobile station transmits a WLAN beacon during the predetermined time window. A WLAN access point, operating with synchronization information and knowledgeable of the predetermined time window, detects the mobile station beacon and will then communicate with the cellular network infrastructure via a backhaul connection, to inform the cellular network that a mobile station has been detected.

[0023] The cellular network then sends a message to the mobile station to cause it to power up its WLAN transceiver and search for a WLAN. Upon successful detection and connection to the WLAN, the mobile station hands over from the cellular network to the WLAN. Further, the mobile station may use the access point beacon information to update a neighbor list or WLAN scan report, or equivalent and to disconnect from the cellular network and continue idle mode activity using the WLAN access point. For example, the mobile station may subsequently mai...

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Abstract

A WLAN access point (111) is synchronized with a Wide Area Network (WAN) (105) via either a backhaul connection (115), or via hardware of the WLAN access point (111) suitable for receiving and decoding a synchronization timing signal from the WAN (105). The mobile station (101) transmits a WLAN beacon during the predetermined time window. A WLAN access point (111) that detects the mobile station (101) beacon will then communicate with the WAN (105) via a backhaul connection (115), to inform the WAN (105) that a mobile station (101) has been detected. The WAN (105) then sends a message to the mobile station (101) to begin to search for a WLAN access point and handover from the WAN (105) to the WLAN.

Description

RELATED APPLICATIONS [0001] This application relates to U.S. Non-Provisional application Ser. No. 10 / 903,819, filed Jul. 30,2004, titled APPARATUS AND METHOD FOR OPERATING A COMMUNICATION DEVICE ON TWO NETWORKS, and U.S. Non-Provisional application Ser. No. ______, filed Aug. 17, 2004, titled MECHANISM FOR HAND OFF USING ACCESS POINT DETECTION OF SYNCHRONIZED SUBSCRIBER BEACON TRANSMISSIONS (Attorney Docket No. CS24073RL), which are commonly owned by the same assignee and incorporated by reference herein.FIELD OF THE INVENTION [0002] The present invention relates generally to cellular and wireless local area networks, and more particularly to wireless local area network access points and handsets having dual mode wireless interface capability. BACKGROUND OF THE INVENTION [0003] Wireless Local Area Networks (WLAN) were originally conceived for data connectivity, for example, connectivity of a personal computer (PC) to the Internet or an Intranet. However, the range of devices and app...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04Q7/24G01S19/48H04W36/14
CPCH04W36/0072H04W36/14H04W48/08Y02B60/50H04W88/06H04W92/045H04W56/0015Y02D30/70H04W36/1446
Inventor KOTZIN, MICHAEL D.
Owner MOTOROLA INC
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